/*
 * Copyright 2016 Google, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.netflix.spinnaker.clouddriver.appengine.deploy;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.Supplier;

public class AppengineMutexRepository {
  private static final ConcurrentHashMap<String, Lock> mutexRepository = new ConcurrentHashMap<>();

  public static <T> T atomicWrapper(String mutexKey, Supplier<T> doOperation)
      throws InterruptedException {
    final Lock lock = mutexRepository.computeIfAbsent(mutexKey, k -> new ReentrantLock());

    lock.lockInterruptibly();
    try {
      return doOperation.get();
    } finally {
      lock.unlock();
    }
  }
}
